Might as well stop reading right there. Where' the proof?
Pieces of the civilian plane on the ground, the pro-Russian insurgents bragging about shooting down a plane (they thought it was a Ukrainian military transport), the Russian BUK missile system photographed nearby. There could be a dispute whether the RF regulars shot flight 17 down or the insurgents did, but since BUK systems do not grow on trees and are not sold at bait and ammo stores, the Russian military is guilty at least of providing the BUKs to the bandits.